Power Generation

Valve & Automation have been supplying manual, on/off and control valves for power generation plants for more than 25 years. 15 years ago a Pump Protection Valve (also known as Automatic Re-circulation Valves or Leak Off Valves with more than 160 bar pump pressure was an exception. Today applications with more than 200 bar pump pressure are nothing special, more or less daily business. A liquid, particularly hot water with an inertial pressure of more than 200 bar has an enormous energy content and consequently a very high potential for wear and destruction in case of an uncontrolled pressure breakdown. The catchword here is cavitation as the most destructive kind of wear. Only a few hours under full cavitation conditions can seriously damage or even destroy effected parts like a valve trim a pump impeller or the ARC-valve bypass. It is with this in mind Schroeder designed the SHP series for modern operating conditions where high fluctuating loads and long periods of operation under extreme partial load conditions are required. Engineers need to ensure that critical pumps remain fully operational and are protected during minimum flow conditions. V&A regularly supply solutions to Eskom power generation plants as well as power plants within Sasol, Sappi and Mondi as well as Sulzer and KSB who manufacture critical pumps for these world class facilities.

For high pressure steam and condensate applications up to PN640 HP Valves in forged steel are the ideal solution. Chemical dosing and handling within the demin plant requires the Richter fully lined valve. Arca control valves are capable of addressing the needs of all pressure reduction, steam conditioning and temperature reduction within power plants. In applications where a Turbine ESD is required, the triple offset Tri-Con metal seated rotary process valve provides fast operation as well as zero leakage.

Fly Ash is another challenge engineers face in production as there is residue and waste. Fly ash is fine powder found in plant exhaust gases exiting the boiler and it is removed before the gas is discharged to atmosphere. It is difficult to handle and is harmful. The fly ash is generally collected in electrostatic precipitator hoppers and then fed into a conveying system. The isolating valve under a ash hopper is normally in open position and it have to close on a static column of ash, without using extreme force or any other unsafe practises. Stafsjö have resigned the HG series knife gate valve is an ideal solution for Fly Ash management.

Valve Selection for Power in General

M = Manual    O = On/Off    C = Modulating Control

Application / MediaMOCV&A Solution
SeriesType
Attemperator Spray Water ValveArcaInjection Desuperheater
Automatic Recirculation Valves (ARC Valves)SchroederMinimum flow recirculation valves
Blow-down & VentingArcaEcotrol Globe Control Valve
Arca350 / 380 High Pressure Control Valve
Chemical handling (demin plant)RichterLined Ball & Butterfly Valves
CyclonesStafsjöMV Knife Gate Valve
Deaerator level control valveArcaChacterised Ball Control
Demin waterRichterLined Ball valve
Emergency Shut Down (ESD) SolutionsZwickTri-Con Triple Eccentric / Triple Offset Rotary Process Valve
ArcaChacterised Ball Control
Feedwater ControlArcaEcotrol Globe Control Valve
ArcaChacterised Ball Control
Feedwater Heater DrainsArcaChacterised Control Ball Valve
ArcaHigh Pressure Control Valve
Flow Balancing control valveArcaChacterised Control Ball Valve
ArcaHigh Pressure Control Valve
Fly AshStafsjöHG series knife gate valve
Fuel GasArcaChacterised Control Ball Valve
Leak Off ValvesSchroederMinimum flow recirculation valves
Main Steam Pipe Drain ValveArcaChacterised Control Ball Valve
ArcaHigh Pressure Control Valve
Manual Isolation - HPZwickTri-Con Triple Eccentric / Triple Offset Rotary Process Valve
HP ValvesHigh Pressure Gate Valves
Manual Isolation - LPJC ValvesRed. & Full Bore Ball Valves
NAFTorex H.P. Metal Seat Butterfly Valve
ZwickTri-Con Triple Eccentric / Triple Offset Rotary Process Valve
HP ValvesLow Pressure Gate Valves
Non ReturnNAFSwing Check
Pressure ControlArcaEcotrol Globe Control Valve
Pump Protection (Min Flow Protection)SchroederMinimum Flow Recirculation Valves
SlurriesStafsjöSLV series knife gate valve
Start-up Drum Control ValvesArca350 / 380 High Pressure Control Valve
ArcaHigh Pressure Control Valve
Start-up Feedwater Control ValvesArca350 / 380 High Pressure Control Valve
Start-up Feedwater Control Valves/ArcaHigh Pressure Control Valve
Steam - ConditioningArcaPRDS Steam Conditioning stations
Steam - DesuperheatingArcaArtes injection desuperheaters
Steam - High Pressure CheckHP ValvesHigh Pressure Check Valves PN160-640
Steam - High Pressure Continuous Blow DownHP ValvesHigh Pressure Continuous Blow Down Valve PN160-640
Steam - High Pressure Gate ValvesHP ValvesHigh Pressure Gate Valves PN160-640
Steam - High Pressure Throttling FlowHP ValvesHigh Pressure Throttling Valve PN160-640
Steam IsolationHP ValvesHigh Pressure Globe Valves PN160-640
Steam Pipe Drain ValveArcaChacterised Control Ball Valve
Sulphur Tail GasZwickTri-Con Triple Eccentric / Triple Offset Rotary Process Valve
Valve Partial Stroke Testing (ESD)FoxboroValve Partial Stroke Testing (ESD)
Valve PositionersFoxboroValve Rotary & Linear Positioners
Velocity ControlArcaEcotrol Globe Control Valve
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